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SEGMENT REPORTING - Summary of Major Customers (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 item
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 48,151 | $ 42,552 | $ 43,380 | $ 46,757 | $ 37,573 | $ 49,791 | $ 62,563 | $ 49,229 | $ 180,840 | $ 199,156 |
Number of major customers | item |  |  |  |  |  |  |  |  | 3 |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 10.00% |  |
Towers |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 160,210 | 170,919 |
Two customers |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Number of major customers | item |  |  |  |  |  |  |  |  | 2 |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 10.00% |  |
Customer One | Tower and Weldments |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 111,480 | 124,759 |
Customer Two | Tower and Weldments |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 23,018 | $ 45,214 |
Five customers |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Number of major customers | item |  |  |  |  |  |  |  |  |  | 5 | 5
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 91.00% | 92.00% |
Customer Three | Towers |  |  |  |  |  |  |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 21,237 |  |

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